Day 4

4.input

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4.py

@@ -0,0 +1,28 @@
+from util import get_input, transpose
+from more_itertools import grouper, flatten
+
+input = get_input("4.input")
+
+numbers = [int(a) for a in input[0].split(",")]
+
+boards = [[[int(a) for a in row.split()] for row in c[1:]] for c in grouper(input[1:], 6, [])]
+
+def check_board(numbers, board):
+    for row in board + transpose(board):
+        if len([a for a in row if a in numbers]) == 5:
+            return True
+    return False
+
+def winners(numbers, boards):
+    all_winners = []
+    for i in range(len(numbers)):
+        winners = [b for b in boards if check_board(numbers[:1+i], b)]
+        for board in winners:
+            boards.remove(board)
+            unmarked = [a for a in flatten(board) if a not in numbers[:1+i]]
+            all_winners.append(sum(unmarked) * numbers[i])
+    return all_winners
+
+all_winners = winners(numbers, boards)
+print(all_winners[0])
+print(all_winners[-1])

4.small.input

@@ -0,0 +1,19 @@
+7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
+
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+ 8  2 23  4 24
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+ 6 10  3 18  5
+ 1 12 20 15 19
+
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+14 21 16 12  6
+
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+10 16 15  9 19
+18  8 23 26 20
+22 11 13  6  5
+ 2  0 12  3  7

util.py

@@ -1,3 +1,6 @@
 def get_input(p, fn=lambda a: a.strip()):
     with open(p) as f:
         return [fn(line) for line in f.readlines()]
+
+def transpose(grid):
+    return [list(row) for row in list(zip(*grid))]